CN219696382U

CN219696382U - Contact arc extinguishing system

Info

Publication number: CN219696382U
Application number: CN202321318093.3U
Authority: CN
Inventors: 管瑞良; 王铖; 朱天胜
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2023-05-29
Filing date: 2023-05-29
Publication date: 2023-09-15
Anticipated expiration: 2033-05-29

Abstract

A contact arc extinguishing system belongs to the technical field of piezoelectric devices. The contact system comprises a moving contact and a fixed contact, wherein the moving contact comprises a short contact and a long contact which are arranged side by side, and the fixed contact is provided with a first fixed contact matched with a first moving contact on the long contact and a second fixed contact matched with a second moving contact on the short contact; the arc extinguishing chamber is provided with an open slot, and is characterized in that: the first movable contact is inserted into the open slot, the second movable contact is positioned outside the open slot, the arc extinguishing chamber further comprises a sealing part, the sealing part is positioned at two sides of the first movable contact on the long contact piece, and the sealing part extends from the arc extinguishing chamber to the movable contact and extends through the second movable contact. The advantages are that: the additionally arranged sealing part effectively prevents the generation of electric arcs between the adjacent second movable contact and the second stationary contact caused by high Wen Youli gas overflow generated when the first movable contact and the first stationary contact on the long contact are separated, thereby avoiding breaking current failure.

Description

Contact arc extinguishing system

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a contact arc extinguishing system.

Background

When moving and static contacts in the circuit breaker are separated, an electric arc can be generated, and if the electric arc is not extinguished rapidly, a safety accident can be brought, so that a reliable contact arc extinguishing device needs to be configured in the circuit breaker to quench the electric arc rapidly to play a role of protecting a circuit.

The contact arc extinguishing system of the circuit breaker generally adopts a mode that one contact mechanism is utilized to match a plurality of contact blades to simultaneously match with a plurality of stacked arc extinguishing bars for arc extinguishing. In order to improve breaking capacity, a plurality of arc extinguishing grid plates are generally required to be combined to form a higher stacking height, and the arc extinguishing grid plates also have wider dimensions in the width direction because of wider widths formed by connecting a plurality of moving contact plates in parallel. With the improvement of working voltage, the market puts forward higher requirements on the reliable breaking performance of the circuit breaker, and the difficulty of short circuit breaking is greatly increased.

In the prior art, the arc is drawn by enlarging the opening distance, pushed and cooled by burning the gas generating material, and extinguished by enhancing the magnetic field. By arranging at least one arc contact in a protruding manner at the end part of the moving contact body, which is close to the arc extinguishing unit, on one hand, the arc contact contacts are contacted with the corresponding fixed contacts earlier than other moving contacts during switching on, and the arc contact contacts are separated from the corresponding fixed contacts later than other moving contacts during switching off, so that only the arc contacts have an arc when breaking current, and the other moving contacts have no arc; and on the other hand, the arc contact is stretched into an arc extinguishing chamber with a narrow slit, and the arc is extinguished by utilizing the narrow slit effect to squeeze the arc and burn the gas generating material while stretching the arc. However, with the increase of breaking capacity, part of high Wen Youli gas overflows backwards from the narrow slits to generate electric arcs between the moving contact and the fixed contact of the adjacent phase, so that breaking current fails.

In view of the above-described prior art, there is a need for a reasonable improvement in the structure of existing contact quenching systems. To this end, the inventors have advantageously devised that the technical solutions described below are created in this context.

Disclosure of Invention

The utility model aims to provide a contact arc extinguishing system, and an additional sealing part of the contact arc extinguishing system effectively prevents arc generation between a second adjacent movable contact and a second fixed contact caused by high Wen Youli gas overflow generated when the first movable contact and the first fixed contact on a long contact are separated, so that breaking current failure is avoided.

The utility model aims at achieving the task, and the contact arc extinguishing system comprises a contact system and an arc extinguishing chamber, wherein the contact system comprises a moving contact and a fixed contact, the moving contact comprises a short contact piece and a long contact piece which are arranged side by side, and the fixed contact is provided with a first fixed contact matched with a first moving contact on the long contact piece and a second fixed contact matched with a second moving contact on the short contact piece; the arc extinguishing chamber is provided with an open slot, the first movable contact is inserted into the open slot, the second movable contact is positioned outside the open slot, the arc extinguishing chamber further comprises a sealing part, the sealing part is positioned on two sides of the first movable contact on the long contact piece, and extends from the arc extinguishing chamber to the movable contact and penetrates through the second movable contact.

In a specific embodiment of the utility model, a plurality of grid plates are arranged in the arc extinguishing chamber, a notch is arranged on each grid plate, the notch corresponds to the open slot, the first movable contact is inserted into the notch, and the second movable contact is positioned outside the notch.

In a specific embodiment of the present utility model, the moving contact further includes a rotating shaft, the short contact piece and the long contact piece are mounted on the rotating shaft, and the sealing portion extends to an outer edge surface of the rotating shaft.

In another specific embodiment of the present utility model, the arc extinguishing chamber further includes an insulating plate, the insulating plate is a pair and is located at two sides of the notch, the insulating plate includes a gas generating portion located inside the notch, and the sealing portion and the gas generating portion are integrally formed to form a whole insulating plate.

In another specific embodiment of the present utility model, the arc extinguishing chamber further includes an insulating plate and a housing, the insulating plate is a pair and is located at two sides of the notch, the grid is located inside the housing, and the sealing portion is disposed on the housing and is located at two sides of the notch.

In yet another specific embodiment of the present utility model, the number of indentations corresponds to the number of long contacts.

In a further specific embodiment of the present utility model, there are one long contact piece installed in each moving contact, and four short contact pieces.

In a further specific embodiment of the present utility model, the stationary contact includes a stationary conductive rod, the second stationary contact and the first stationary contact are mounted on the stationary conductive rod, and the second stationary contact and the first stationary contact are disposed on two rows.

In a further embodiment of the utility model, the arc chute is further provided with an orifice plate above the grid of the array, said orifice plate being placed on the exhaust channel of the arc chute.

The utility model has the beneficial effects that due to the adoption of the structure, the utility model has the following advantages: the two sides of the first movable contact of the long contact on the movable contact are provided with the sealing parts, the sealing parts extend from the arc extinguishing chamber to the movable contact and extend to the second movable contact of the short contact, so that the first movable contact and the second movable contact are separated, and arc generation between the adjacent second movable contact and the second fixed contact caused by high Wen Youli gas overflow generated when the first movable contact on the long contact is separated from the first fixed contact is prevented, and breaking current failure is avoided.

Drawings

Fig. 1 is a perspective view of a contact arc extinguishing system according to the present utility model;

fig. 2 is a perspective view of the moving contact according to the present utility model;

FIG. 3 is a perspective view of a stationary contact according to the present utility model;

fig. 4 is a perspective view of an arc chute according to the present utility model;

fig. 5 is a cross-sectional view of an arc chute according to the present utility model;

fig. 6 is a schematic view of a part of the structure of the contact arc extinguishing system according to the present utility model.

In the figure: 1. contact system, 11. Moving contact, 111. Moving contact, 1111. Long contact, 11111. First moving contact, 1112. Short contact, 11121. Second moving contact 112, a rotating shaft, 1121, an outer edge surface, 113, a clamping end, 114, a pin shaft, 12, a static contact, 121, a static conductive rod, 122, a second static contact and 123, and a first static contact; 2. arc extinguishing chamber, 21, grating, 211, notch, 22, shell, 23, pore plate, 24, insulating plate; 100. a gas generating part; 200. a closing part; 300. an open slot.

Detailed Description

The following detailed description of specific embodiments of the utility model, while given in connection with the accompanying drawings, is not intended to limit the scope of the utility model, and any changes that may be made in the form of the inventive concepts described herein, without departing from the spirit and scope of the utility model.

In the following description, any reference to the directions or azimuths of up, down, left, right, front and rear is based on the positions shown in the corresponding drawings, and therefore, should not be construed as a limitation on the technical solutions provided by the present utility model.

Referring to fig. 1, the utility model relates to a contact arc extinguishing system, which comprises a contact system 1 and an arc extinguishing chamber 2, wherein the contact system 1 and the arc extinguishing chamber 2 are matched, when a circuit breaker breaks, an arc is generated on the contact system 1, and after entering the arc extinguishing chamber 2, the arc is extinguished in the arc extinguishing chamber 2, so that current is cut off, and the circuit breaker successfully breaks the current.

The contact system 1 comprises a moving contact 11 and a fixed contact 12, wherein the moving contact 11 is contacted with or separated from the fixed contact 12 after acting, so that the circuit breaker is closed or opened.

As shown in fig. 2, the movable contact 11 includes a rotating shaft 112 and a movable contact piece 111, and the movable contact piece 111 is mounted on the rotating shaft 112. When the circuit breaker acts, an operating mechanism of the circuit breaker drives the rotating shaft 112 to rotate, and the rotating shaft 112 drives the movable contact 111 to swing after rotating, so that the contact or separation between the movable contact 11 and the fixed contact 12 is realized.

As shown in fig. 1 and 2, the movable contact 111 includes a short contact 1112 and a long contact 1111 disposed side by side, and the length of the long contact 1111 is greater than the length of the short contact 1112. After the two are mounted, the head of the long contact 1111 is located inside the arc extinguishing chamber 2, and the head of the short contact 1112 is located outside the arc extinguishing chamber 2, as shown in fig. 1. A first movable contact 11111 is provided on the long contact 1111; similarly, a second movable contact 11121 is provided on the short contact 1112. The first movable contact 11111 extends into the arc-extinguishing chamber 2, and the second movable contact 11121 is located outside the arc-extinguishing chamber 2.

The rotating shafts 112 are also provided with clamping ends 113 for ensuring the positioning of the adjacent rotating shafts 112, and the clamping ends 113 are clamped into the adjacent rotating shafts 112 to realize synchronous rotation between the rotating shafts 112. The rotating shaft 112 is further provided with a pin 114, two ends of the pin 114 passing through the short contact 1112 and the long contact 1111 are arranged on two side surfaces of the rotating shaft 112, and the pin 114 is used for rotatably arranging the short contact 1112 and the long contact 1111 on the rotating shaft 112, i.e. the short contact 1112 and the long contact 1111 not only can rotate along with the rotating shaft 112, but also can rotate by a certain amplitude relative to the rotating shaft 112.

As shown in fig. 3, the stationary contact 12 includes a stationary conductive rod 121, a first stationary contact 123 and a second stationary contact 122 are disposed on the stationary conductive rod 121, the second stationary contact 122 and the first stationary contact 123 are disposed on two rows, and one row of the second stationary contact 122 is closer to the rotating shaft 112 than one row of the first stationary contact 123. The second stationary contact 122 is configured to mate with the second movable contact 11121, and the first stationary contact 123 is configured to mate with the first movable contact 11111, so as to achieve two-to-two contact or separation, i.e. corresponding relationship in position.

In the present embodiment, there are one long contact 1111 installed in each moving contact 11, and four short contacts 1112. Two short contacts 1112 are provided on each side of the long contact 1111.

The circuit breaker generally comprises at least two groups of contact extinguishing systems, each group of contact extinguishing systems comprising a group of contact systems 1 and an extinguishing chamber 2, each group of contact systems 1 comprising a moving contact 11 and a stationary contact 12.

As shown in fig. 4 and 5, the arc extinguishing chamber 2 is provided with an open slot 300, the first movable contact 11111 extends into the open slot 300, and the second movable contact 11121 is located outside the open slot 300. Specifically, the arc extinguishing chamber 2 is internally provided with a plurality of grid sheets 21 in array, and the grid sheets 21 are arranged at intervals. The grid 21 is a metal grid, typically a metal plate. The arc extinguishing chamber 2 further comprises a shell 22, the shell 22 is a shell of the arc extinguishing chamber 2, and the grid sheet 21 is arranged inside the shell 22. The housing 22 provides a basis for mounting and positioning the grating 21.

Above the grid 21 of the array, i.e. away from the top of the arc-extinguishing chamber 2 of the contact system 1, there is also installed a perforated plate 23, said perforated plate 23 being placed on the exhaust channel of the arc-extinguishing chamber 2, filtering the exhaust gases after the arc has been extinguished.

As shown in fig. 4 to 6, a notch 211 is provided on the side of the grid 21 facing the contact system 1, and the notch 211 corresponds to the open slot 300 on the outer side of the arc extinguishing chamber 2. While the head of the long contact 1111 protrudes into the notch 211 through the open slot 300. Since the head of the short contact 1112 is located outside the arc extinguishing chamber 2, the gate 21 is not provided with a notch 211 at a position facing the short contact 1112. Therefore, the number of the notches 211 is identical to the number of the long tabs 1111, that is, one long tab 1111 corresponds to one notch 211. More specifically, the first movable contact 11111 of the long contact 1111 protrudes into the notch 211. And the second movable contact 11121 is located outside the notch 211.

The insulating plates 24 are arranged at two sides of the notch 211, the insulating plates 24 are in a pair and are positioned at two sides of the notch 211, the insulating plates 24 comprise a gas generating part 100 positioned inside the notch 211 and a sealing part 200 positioned outside the notch 211, and in particular, the sealing part 200 extends from the arc extinguishing chamber 2 to the moving contact 11 and extends through the second moving contact 11121. That is, the closing portion 200 extends from the arc extinguishing chamber 2 toward the rotating shaft 112 and extends beyond the second movable contact 11121. Thus, the first movable contact 11111 and the second movable contact 11121 are located on both sides of the closing portion 200, respectively. Alternatively, the closing portion 200 is located between the first movable contact 11111 and the second movable contact 11121. As shown in fig. 1, in this embodiment, the sealing portion 200 extends to the outer edge 1121 of the rotating shaft 112, so as to ensure that the sealing portion 200 extends beyond the second movable contact 11121, so as to prevent the high-temperature free gas in the gap 211 from overflowing backward from the gap 211 to cause an arc between the adjacent second stationary contact 122 and second movable contact 11121, and avoid breaking failure. That is, the sealing portion 200 prevents the high-temperature free gas in the gap 211 from overflowing and moving to both sides.

In this embodiment, the gas generating portion 100 and the sealing portion 200 are integrally formed, that is, the gas generating portion 100 and the sealing portion 200 are integrally formed into a single piece of the insulating plate 24.

As another embodiment, the insulating plate 24 includes the gas generating portion 100 located inside the notch 211 and the sealing portion 200 located outside the notch 211, but the gas generating portion 100 and the sealing portion 200 are separately disposed, that is, the gas generating portion 100 and the sealing portion 200 are two parts, wherein the gas generating portion 100 is plate-shaped made of a gas generating material, and the sealing portion 200 is plate-shaped made of an insulating material, that is, the sealing portion 200 does not need gas generation. The sealing portion 200 is disposed on the housing 22 and located at two sides of the notch 211, and extends to the outer edge 1121 of the rotating shaft 112.

Claims

1. The contact arc extinguishing system comprises a contact system (1) and an arc extinguishing chamber (2), wherein the contact system (1) comprises a moving contact (11) and a fixed contact (12), the moving contact (11) comprises a short contact piece (1112) and a long contact piece (1111) which are arranged side by side, and the fixed contact (12) is provided with a first fixed contact (123) matched with a first moving contact (11111) on the long contact piece (1111) and a second fixed contact (122) matched with a second moving contact (11121) on the short contact piece (1112); be equipped with open slot (300), its characterized in that on explosion chamber (2): the first movable contact (11111) is inserted into the open slot (300), the second movable contact (11121) is positioned outside the open slot (300), the arc extinguishing chamber (2) further comprises a sealing part (200), the sealing part (200) is positioned at two sides of the first movable contact (11111) on the long contact sheet (1111), and extends from the arc extinguishing chamber (2) to the movable contact (11) and extends through the second movable contact (11121).

2. The contact quenching system as claimed in claim 1, wherein: the arc extinguishing chamber (2) is internally provided with a plurality of grid sheets (21) of an array, the grid sheets (21) are provided with notches (211), the notches (211) correspond to the open grooves (300), the first movable contact (11111) stretches into the notches (211), and the second movable contact (11121) is positioned outside the notches (211).

3. The contact quenching system as claimed in claim 1, wherein: the movable contact (11) further comprises a rotating shaft (112), the short contact piece (1112) and the long contact piece (1111) are arranged on the rotating shaft (112), and the sealing part (200) extends to the outer edge surface (1121) of the rotating shaft (112).

4. A contact quenching system as claimed in claim 2, wherein: the arc extinguishing chamber (2) further comprises a pair of insulating plates (24), the insulating plates (24) are positioned on two sides of the notch (211), the insulating plates (24) comprise gas generating parts (100) positioned in the notch (211), and the sealing parts (200) and the gas generating parts (100) are integrally formed to form a whole piece of the insulating plates (24).

5. A contact quenching system as claimed in claim 2, wherein: the arc extinguishing chamber (2) further comprises an insulating plate (24) and a shell (22), the pair of insulating plates (24) is arranged on two sides of the notch (211), the grid sheet (21) is arranged in the shell (22), and the sealing part (200) is arranged on the shell (22) and is arranged on two sides of the open slot (300).

6. A contact quenching system as claimed in claim 2, wherein: the number of the notches (211) is identical to the number of the long contact pieces (1111).

7. The contact quenching system as claimed in claim 1, wherein: the number of the long contact pieces (1111) installed in each moving contact (11) is one, and the number of the short contact pieces (1112) is four.

8. The contact quenching system as claimed in claim 1, wherein: the static contact (12) comprises a static conductive rod (121), the second static contact (122) and the first static contact (123) are arranged on the static conductive rod (121), and the second static contact (122) and the first static contact (123) are arranged on two rows.

9. A contact quenching system as claimed in claim 2, wherein: the arc extinguishing chamber (2) is further provided with a pore plate (23) above the grid plates (21) of the array, and the pore plate (23) is arranged on an exhaust channel of the arc extinguishing chamber.